File and other tools having tapering tangs



(No Model.)

J. F. FRENCH.

FILE AND OTHER TOOLS HAVING TAPERING TANGS. No. 285,989.

Patented Oct. 2, 1883.

INVEYNTUR WI TNILSIS [gs N. PETERS, Phulc-Lithngmpher, wnslumu. D. c.

3o hereinafter, for while it NITED STATES ATEN'I twice.

FILE AND OTHER TOOLS HAVING TAPEJRING TANGS.

SPECIFICATION forming part of Letters Patent No. 285,989, dated October 2, 1883.

7 Application filed August 27, 1883. (N model.) I

To ctZZ whom it may concern:

Be it known that I, JosIAH F. FRENCH, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented a certain Improvement in Files and other Tools having Tapering Tangs, of which the following is a specification.

My invention relates to files or other tools which are provided with tapering tangs adapt- IO ed to be driven into wooden handles; and the object of my invention is to so thread the tapering tang of a tool of this class that a handle of which a nut forms a part may be screwed on and unscrewed from the tang, the thread I 5 of the latter being at the same time such as not to interfere with the driving of the tang into an ordinary handle in the absence of a special handle.

In the accompanying drawings, Figure 1 is a side view of part of a flat file having a tapering tang made according to my invention; Fig. 2, a transverse section on the line 1 2; Fig. 3, a sectional view of a handle adapted to the tang, and Fig. 4a modification of the invention.

My invention may be applied to any file or other tool provided with a tapering tang-a chisel, for instanceand it is not intended to alter or modify the tang as regards general shape, excepting in the particulars explained is made to screw into a nut embedded in a special handle, it must be such that it can be driven into an ordinary handle in the usual way.

A portion, a, of the tapering tang Ads 3, 5 threaded, the thread extending in the present instance over the opposite edges only, as shown in Fig. 2; and this threaded p ortion of the tang is adapted to the internally-threaded part as of a tube, D, which is driven into the wooden 4o portion B of a handle, so that on screwing the latter onto the tang the end of the tube D may be brought to bear on shoulders m m of the tool, or against the edges of the tang, thereby firmly securing the handle to its place.

It should be understood that the handle forms no part of my present invention, and that any handle in which is a nut adapted to the threaded portion of the tang may be applied to the same.

The tang must be parallelly threaded-that is to say, a dotted line, f, indicating the bot tom ofthe thread on one edge of the tang, must be parallel with the dotted line 1/, indicating the bottom of the thread 011 the opposite edge of the tang, for to make the thread on a taper would interfere with the proper tightening of the end of the handle to its bearing.

The tang should always terminate in a plain portion, 1), for if the screw-thread should be continued to the extreme end of the tang it would interfere with the proper driving of the same into an ordinary handle, and this might often be required in the absence of a special handle. For the same reasonit is always best to confine the thread within the limits indicated by the dotted line w w, coinciding with the inclined edge of the tang, this, of course, involving the necessity of making the thread gradually shallower as it approaches the end of the tang; but the thread is none the less parallelly cut and adapted to the parallelly-cut thread a: in the tube D of the handle.

A perfect parallelly-cut thread adapted to the internal thread, a, of like character, may be made on a tapering tang, as shown in Fig.

4,- but the tang in this case also should terminate in a plain tapering portion, 2), to be driven into the wood of an ordinary handle, 13, the orifice in which is made to avoid the threaded portion of the tang.

The invention is not restricted to the tangs of flat files or chisels, for the desired thread may be out on the tapering tang of a square, round, or triangular file, or, indeed, on the tapering tang of any other tool.

I am aware that a tapering thread has been cut on a tapering tang for screwing into and permanent attachment to a block externally threaded for screwing into a wooden handle; but it is essential to my invention, as before remarked, that the tang should be parallelly threaded.

The handle I) is hereby disclaimed in this application, as it forms the subject of another application for a patent filed by me August 24, 1883, Serial N 0. 104,634.

I claim as my invention As a new manufacture, a file or other tool having a tapering tang, on a portion, a, of which a screw-thread is parallelly cut,the tang terminating in a plain tapering portion, 1), as set forth.

I11 testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

JOSIAH F. FRENCH. Witnesses:

HARRY L. ASHENFELIER, HENRY HowsoN, Jr. 

